docs: docs update (#911)

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Fixes #<issue_number_goes_here> 🦕
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+.details {
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+</style>
+
+<h1><a href="verifiedaccess_v1.html">Chrome Verified Access API</a> . <a href="verifiedaccess_v1.challenge.html">challenge</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#create">create(body=None, x__xgafv=None)</a></code></p>
+<p class="firstline">CreateChallenge API</p>
+<p class="toc_element">
+  <code><a href="#verify">verify(body=None, x__xgafv=None)</a></code></p>
+<p class="firstline">VerifyChallengeResponse API</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="create">create(body=None, x__xgafv=None)</code>
+  <pre>CreateChallenge API
+
+Args:
+  body: object, The request body.
+    The object takes the form of:
+
+{ # A generic empty message that you can re-use to avoid defining duplicated
+      # empty messages in your APIs. A typical example is to use it as the request
+      # or the response type of an API method. For instance:
+      # 
+      #     service Foo {
+      #       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+      #     }
+      # 
+      # The JSON representation for `Empty` is empty JSON object `{}`.
+  }
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Result message for VerifiedAccess.CreateChallenge.
+    &quot;challenge&quot;: { # The wrapper message of any data and its signature. # Generated challenge
+      &quot;signature&quot;: &quot;A String&quot;, # The signature of the data field.
+      &quot;data&quot;: &quot;A String&quot;, # The data to be signed.
+    },
+    &quot;alternativeChallenge&quot;: { # The wrapper message of any data and its signature. # Challenge generated with the old signing key
+        # (this will only be present during key rotation)
+      &quot;signature&quot;: &quot;A String&quot;, # The signature of the data field.
+      &quot;data&quot;: &quot;A String&quot;, # The data to be signed.
+    },
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="verify">verify(body=None, x__xgafv=None)</code>
+  <pre>VerifyChallengeResponse API
+
+Args:
+  body: object, The request body.
+    The object takes the form of:
+
+{ # signed ChallengeResponse
+    &quot;challengeResponse&quot;: { # The wrapper message of any data and its signature. # The generated response to the challenge
+      &quot;signature&quot;: &quot;A String&quot;, # The signature of the data field.
+      &quot;data&quot;: &quot;A String&quot;, # The data to be signed.
+    },
+    &quot;expectedIdentity&quot;: &quot;A String&quot;, # Service can optionally provide identity information about the device
+        # or user associated with the key.
+        # For an EMK, this value is the enrolled domain.
+        # For an EUK, this value is the user&#x27;s email address.
+        # If present, this value will be checked against contents
+        # of the response, and verification will fail if there is no match.
+  }
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # Result message for VerifiedAccess.VerifyChallengeResponse.
+    &quot;signedPublicKeyAndChallenge&quot;: &quot;A String&quot;, # Certificate Signing Request (in the SPKAC format, base64 encoded) is
+        # returned in this field. This field will be set only if device has included
+        # CSR in its challenge response.
+        # (the option to include CSR is now available for both user and machine
+        # responses)
+    &quot;deviceEnrollmentId&quot;: &quot;A String&quot;, # Device enrollment id is returned in this field (for the machine response
+        # only).
+    &quot;devicePermanentId&quot;: &quot;A String&quot;, # Device permanent id is returned in this field (for the machine response
+        # only).
+    &quot;verificationOutput&quot;: &quot;A String&quot;, # For EMCert check, device permanent id is returned here.
+        # For EUCert check, signed_public_key_and_challenge [base64 encoded]
+        # is returned if present, otherwise empty string is returned.
+        # This field is deprecated, please use device_permanent_id or
+        # signed_public_key_and_challenge fields.
+  }</pre>
+</div>
+
+</body></html>
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